Pressure-gage



(Remodel.)

` A. V. HARTWELL.

PRESSURE GAGE.'

- Patented Aug. 11, 1885.. @l

lll

UNITED STATES PATENT OFFICE.,

ABRAHAM V. HARTWELL, OF CHICAGO, ILLINOIS.

PRESSURE-GAGE.

PECIFICATION forming part of `Letters Patent No. 324,251, dated August11, 1885.

Application filed February 7, 1885. (No model.)

-V WELL, of Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Gages, which improvement isfully set forth in the following specification and accompanyingdrawings.

My improvement can be used upon either a steam or water gage, but ismore particularly adapted to a water-gage. It consists inapplying'mercury,wine, glycerine,or any simiy lar sensitive matter orduid not easily frozen, between the operating mechanism of the gage andthe pressure of the steam or water, in providing asuitable chamber orreceptacle for holding such matter or Huid, and in providing a bentmetal tube with suitable intermediate connections between-it and theindex or pointer on the dial-plate.

It is well known that in many of the gages in common use wherein thesteam or water is forced into direct contact with the delicate mechanismof the gage a deposit will accumulate in the tubes or other receptacles.Especially is this the case when the water contains much salt or alkali,and in time, if not carefully watched, the gage will become useless, andby reason of not properly indicating the variations of the pressure anexplosion may take place. In such gages, by reason of this deposit, theyfrequently get out of order. I propose to obviate these objections by mymprovement and to construct a gage simple in its construction andmechanism, and that will automatically work for an indefinite time.

I do not claim to be the first to construct a gage having mercury orquicksilver placed between the steam or water and the interior of thegage. Such devices are shown in the Patents No. 102,464, of April 26,1870, to M. E. Campfield, and No. 170,706, of December 5, 1875, to JamesBurden; but I claim to have invented a new andimproved device by whichthe pressure of the steam or water can be indicated in a lesscomplicated manner and by a more perfect mechanism than is shown in anyprior patent.

My invention is designed for use in connection with the well-knownBourdon pressuregage.

In the accompanying drawings, Figure 1 represents a plan View of theoperating. mechanism of my invention with the dial-plate of the gageremoved. Fig. 2 is a vertical sectional view ofthe same, and also oftheremaining parts of my invention.

H is a cup or chamber made into two parts, securely fastened together atO O.

K is a diaphragm of any suitable material, securely fastened between thetwo parts of the chamber H.

G is a pipe extending from the chamber H, or it may be an extensionthereof.

A is a bent tube firmly secured at its open end to the pipe G, so thatthere shall be a connection and opening from the chamber H into the benttube A. This tube hangs suspended above and parallel to the'plate orbottom of the casing L, inclosing the operating mechanism of the gage,and its closed end is free to vibrate or oscillate when the mercury orfluid in it is operated upon by the steam or water. This tube A and itsattendant mechanism can be placed in any position convenient or'desired.I have described it thus as the most convenient way to use it.

C is a connecting-link between the loose or free end of the tube A andthe loose end of a segment, D. This segment is pivoted at P, and worksinto the cog-wheel E on the pivot P. On this pivot PQI place a spring,S. The index-linger B is also on this pivot P. The spring S serves, whenproperly set, to hold the index-linger B at zero or at any other desiredpoint, and, by means of its tension and the tendency of the bent tube toregain its normal position after release of the pressure of the steam orwater, keeps the index-linger 0r pointer at such desired point when thepressure of the steam or water is removed. These several partsC, D, P,P', and S are kept in proper position between the bars M N, the formerbeing securely fastened to the plate or bottom of the casing L. A partof the top bar, N, is broken away to expose the mechanism.

Thegchamber H may be of any desired shape.

' The fluid desired to be used, whether mercury, wine, glycerine, or anysimilar substance, is rst put into that part of the chamber next thegage until it, with the pipe G and tube A, is filled to its utmost, andthen conned there IOO in by the diaphragm K or a iight valve, cr anyother mode that will allow the variation of the pressure of the Huid ofthe Water or steam to be communicated through the fluid in the chamberto the operating mechanism of the gage.

I do not wish to be confined t0 the peculiar shape of the chamber asshown, nor lo the diaphragm as shown.

It is obvious that the cup or chamber should be made of strong metal.

The pressure of the steam or water is applied through the pipe G- intothe empty part of the cup or chamber H upon the diaphragm. On accountofthe sensitiveness ofthe fluid in the cup H and tube A it is obviousafter the pressnreis applied the ltube A will be affected and thetendency will be l'o straighten it out.

In its el'orts to straighten, it will act through the intermediatemechanism on the indexfin ger according to the variations of thepressure of the steam or water, and by means o1' the proper marks on thedial-plate the pressure may be known.

XVhat I claim, and desire to secure by Letters Patent, isl rlhecombination of the large chamber Il, having the diaphragm K, and lilled,as de scribed, with mercury or a similar substance, with a Bourdonpressure-gage, l'o prevent incrustation in the latter, substantially asshown and described.

ABRAHAM V. IIAR'l\VEl3L. Til'nessesz I. ll. 'I. MAsoN,

. F. GLoUcIr.

